Abstract: A reinforcement element intended for essentially U-shaped elongate building blocks manufactured by using the sliding form casting technique. The reinforcment element consists of a plurality of first pretensioned equidistantly spaced steel wires deposited in the longitudinal direction of the block, above or below which wires is positioned, in parallel therewith, a wire net composed of two longitudinal wires and a plurality of equidistantly spaced transverse cross rods the ends of which are bent about the longitudinal wires. The invention likewise concerns a method and a machine to produce such reinforcement elements.

Abstract: A machine of introducing sound-insulating members of a resilient material at predetermined places in concrete beams formed by a lower concrete element, preferably coffer-shaped, and an upper concrete element in the form of a slab. The machine comprises means to raise the upper element from the lower element so as to form therebetween a gap intended to receive the sound-insulating members, means to sense the vertical dimensions of said gap, means to cut off a piece of insulating material the vertical dimensions of which agree with those of the gap, means to apply an adhesive to said member, and means to position said member in the gap in the predetermined position. The invention ensures that the total thickness of concrete beams including such a sound-insulating layer is equal for all beams thus composed irrespective of the individual thickness of the discrete concrete elements.